Super Cub Build

[r/c basher]

Seeing how Hobbypartz is offering free shipping, I think this would be a great time to start on the Hobbyzone Super Cub build. Ill probably go brushless and spektrum right away and later on install ailerons. Heres my list of components Ill probably end up using-
radio-dx6i
receiver-ar6200
servos-hxt900s
esc-exceed rc 30 amp esc
motor-exceed rc alpha 480 910kv outrunner, www.hobbypartz.com/alpha-480--910kv--outrunner-brushless-motor.html

Does anyone see a problem with using the alpha motor with a 30 amp esc? I would go with a 40 amp but I already have a 30 amp. Thanks.

[Gabe]

Looks like the motor produces 20amps of current on a 3S with a 25 amp burst at WOT. Your 30 amp esc should be fine for your new Super Cub. Just make sure there's some ventilation for cooling if you're running WOT for more than 10 seconds at a time.

[r/c basher]

Thanks Gabe. How should I go about mounting the motor? Also how did you figure out how many amps the motor would draw? Whats the formula? Ill post more later, Im running late. Thanks.

[19000rpm]

The real trick way to mount that motor would be with a CustomRCParts CNC mount. secure.hobbyzone.com/cgi-bin/UCSearch?MERCHANTID=hz&MERCHANTSEARCHID=2428105&RANGEBEGIN=1&RANGEEND=50&REFERERURL= You'll need to push the shaft through.

You won't need to push the shaft through if you use the prop adapter and motor mount that comes with the motor. It all depends on what motor mounting system you use.

Another way to do the motor mount is to use the one that comes with the motor and use aluminum tubing standoffs cut to right length to get the motor shaft at the correct length and angle as it sticks out of the cowling.

Yet another way is to make a plywood secondary firewall screwed to the plastic firewall and use a plastic t-28/Corsair motor mount screwed to that. If you look at my stagger wing pics you'll see that option.

You just need to look at the motor specs to see if the motor is going to draw the right amount of amps. Generally speaking; you'll always be OK with a 30A ESC on a 480/980-1100kV size motor and a 9 to 10 prop with around 7 pitch.

When you get to the ailerons: Cut the dyhedral out and make the ailerons large, 2X11, or longer, if you want it to do axial rolls. If you leave the dyhedral in it will turn well, but not do anything but a big sloppy barrel roll. Check out my Clipped wing Cub for how I do the ailerons.

As an alternative: You can do the aileron mod in two stages: Stage 1 would be to cut the ailerons in the stock wing and then in stage 2 cut the dyhedral out.

Have fun.

[r/c basher]

Thanks 19, Ill decide on the way to mount it when I get the motor. I was thinking for ailerons instead of cutting them into the wings, maybe adding them on instead, people on Rcgroups said that it seems to work better, I dont know though.

[19000rpm]

I haven't tried adding them. I'm sure that would work though. Might look a little odd. I did talk to a guy the other day that made some really deep ones that stuck out past the trailing edge. He said that worked out well.

[Gabe]

Adding ailerons by cutting is really simple. A sharp hobby knife and some hinge tape is all you need. It's amazingly easy.

Just cut a 45 degree angle cut across the underside and leave the top flush. Deflect the aileron each way and add hinge tape while it's deflected. 5-10 minute job.

OR, if you like you can always add the aileron hinges too.

[r/c basher]

Thanks guys. I ordered the alpha motor last night and also ordered me a thunder ac6 charger. The free shipping worked, I think I have most the electronics except servos. Still got to order hardware and a prop.

Also Im going to order some Dubro wheels since Im going to be flying off of grass. Right now when ever I land the SC flips over.

[Gabe]

Sept 21, 2010 5:30:29 GMT -6 r/c basher said:

Also how did you figure out how many amps the motor would draw? Whats the formula?

I missed this, sorry Basher. On the link you included above, the specs are listed alongside the picture of the motor. I'm assuming that you are going to be building the Hobbyzone Super Cub LP from a bare bones set of parts.
secure.hobbyzone.com/index/index_park_flyers_rtf/HBZ7300.html


If that's the case, its a 9x6 prop that's used. Hobbypartz suggested that the motor in question is a direct replacement for the stock one, ergo we can only assume that the specs listed are accurate.

For more precise measurements, I would get a hold of a current meter and throttle up on the bench. Check the amps at WOT to ensure you aren't in the danger zone. I believe we found a current meter from Hobby King for about $45.

[Solitaire]

This volt/amp meter is about as cheap as you can get. Simple to use as it fits inline between the LiPo and the ESC. Just get or make up some adaptors if you aren't using Deans.
www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=8319&Product_Name=HexTronik_VA-Tester__%28Voltage_&_Current_indicator%29

[Gabe]

Wow! That is cheap!

[r/c basher]

Thanks Gabe and Sol. I have a stock hobbyzone super cub lp that Ive had for a while now and finally have decided to upgrade it to brushless, 2.4ghz and ailerons, so its more of a modification I guess than a build from scratch.

Thanks for the link Sol to that volt/amp meter its really cheap but about 50% of the reviews say it doesnt work at all or that the readings are way off.

Hobbypartz said that they shipped out my order so thats good.

[Solitaire]

Sept 23, 2010 14:13:43 GMT -6 r/c basher said:

...Thanks for the link Sol to that volt/amp meter its really cheap but about 50% of the reviews say it doesnt work at all or that the readings are way off...

Ooops, sorry basher. I got mine two years ago (works fine) and haven't bothered to read the reviews on it lately. Guess I should have done that before posting. ;D

[Gabe]

Basher,

If you do pick up at current meter, try picking up some extra props too. If the stock is a 9x6 and there's plenty of cushion with the amps, try a 10x5 or a 10x6 or even a 10x7.

The amount of thrust gained by propping up a full inch is amazing. With an 11x7 prop and a Power 25, my t-28 takes off in 20 feet!

Remember the second number is your pitch. As the prop diameter and pitch approach 1:1 (ie, 9x9) your torque will decrease and you start losing vertical climbing ability. 10x5 and 10x6 is a great starting point for your prop testing.

[19000rpm]

With a 480 brushless and 9.5x7.5 prop it will get off the ground in 3-5 ft.